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P0128 Diagnostic Trouble Code Discussion for May 2008

Thermostat System Malfunction

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Trouble Ticket Help Requests for DTC P0128
Help Request Posted
2003 GMC Envoy SLT 4.2L MIL Lamp on VIN: 1GKDT13SX3
P0128: Engine Coolant Temperature Below Thermostat Regulating Temperature. ... U1000 code that keeps resetting under both PCM & IPC. Vehicle came in and customer stated that MIL light was on but went off on the way over to us. For the P0128 code I'm going to replace the thermostat. The U1000 co...
May 28, 2008